/**
 * 
 */
package d.qapaper.tool;

import java.security.MessageDigest;

/**
 * @author Kaven
 *
 */
public class MD5 {
	private String inStr;
	private MessageDigest md5;

	public MD5() {

	}

	public MD5(String inStr) {
		this.inStr = inStr;
		try {
			this.md5 = MessageDigest.getInstance("md5");
		} catch (Exception e) {
			System.out.println(e.toString());
			e.printStackTrace();
		}
	}

	/**
	 * 生成MD5加密字符串
	 * 
	 * @return 加密字符串
	 */
	public String compute() {

		char[] charArray = this.inStr.toCharArray();

		byte[] byteArray = new byte[charArray.length];

		for (int i = 0; i < charArray.length; i++)
			byteArray[i] = (byte) charArray[i];

		byte[] md5Bytes = this.md5.digest(byteArray);

		StringBuffer hexValue = new StringBuffer();

		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16)
				hexValue.append("0");
			hexValue.append(Integer.toHexString(val));
		}

		return hexValue.toString();
	}
}
